Table 6.

F-test result.

F-Test two-sample for variances
	Mammo	Histology
Mean	0.880398	0.97702
Variance	0.001181	5.19E−32
Observations	20	20
Df	19	19
F	2.27E+28
P(F <  = f) one-tail	1.9E−265
F Critical one-tail	2.168252